JP2005300567A - Lens interchangeable camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for preventing short circuitings, noise occurrence and mutual interferences, when requiring a great number of electric connection terminals in particular, in a lens interchangeable camera. <P>SOLUTION: The system separates an electrical connection terminal between a lens unit 20 and a body 30 into a plurality of blocks, for instance, a ground block 41, a power source block 42 and a signal block 43 for each classification, and arranges the separated blocks 41, 42 and 43 at a position separated on the circumference of a connection part of a mounting part of the camera, for instance, at the rear side of a mounting claw 32 respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an interchangeable lens camera. More specifically, for an interchangeable lens camera that incorporates an image sensor, an image processing device, etc. on the lens side, and requires a large number of information transmission and electrical continuation for operation control between the lens unit and the camera body. The present invention relates to a suitably applied technique.

  Conventionally, in general, when an interchangeable lens camera is connected to the camera body, it is necessary to perform electrical connection at the same time for communication and power supply between the lens unit and the camera body. A terminal is provided. When the lens unit is not attached to the camera body, this connection terminal is exposed, for example, on the camera body side. There are problems such as damage. Various techniques for solving such a problem have been developed.

  For example, a plurality of camera body side electrical connection terminals are arranged substantially along the direction around the optical axis, and at least two power supply terminals are provided with a height difference in the contact direction by forming a step in the contact direction, At the position perpendicular to the contact direction of the electrical connection terminal on the camera body side, a protrusion protruding from the connection terminal in the contact direction is formed, and cut to a position corresponding to the protrusion when the two mounts are connected and disconnected. There is a technique in which a notch is formed (for example, see Patent Document 1).

  In this technique, a step is provided at the position of the power supply side terminal of the camera mount so that even if a metal foreign object enters, it is not easily short-circuited. Since this technique provides a difference in the height of the terminals, it cannot be used with anything other than a flat shape. Further, it relates only to the power supply terminal, and has not been solved for interference with other terminals, noise, and the like.

  In addition, it has a biasing member for biasing each contact so that each contact on the interchangeable lens side mount portion contacts each contact on the camera body side, and the same circle in a plane perpendicular to the lens optical axis. There is an interchangeable lens which is arranged on the circumference and arranged so that a plurality of contacts slide during rotation operation, and the interval between the power terminals is set to be different from other terminals (for example, see Patent Document 2). .

  This technique prevents an electrical short circuit by making the arrangement distance of the terminals different so that the power supply / ground does not contact the signal line when the lens is attached / detached. However, it does not deal with foreign object insertion.

Furthermore, the conventional single-lens reflex camera hardly requires a communication function between the lens and the main body. Therefore, the number of terminals is small, and the arrangement when the number of terminals is increased is difficult. Further, the terminals are also arranged in blocks, and depending on the type of electric signal, the generation of noise is unavoidable, and there is a possibility that a problem of mutual interference occurs.
Japanese Examined Patent Publication No. 7-34094 (page 2-6, FIG. 1) Japanese Examined Patent Publication No. 4-11850 (page 1-3, FIG. 1)

  The present invention solves the above problems, and when a lens unit is not mounted in an interchangeable lens camera, a short circuit does not easily occur even if a foreign object enters the camera mount portion on the camera body side. It is an object of the present invention to provide a system that can cope with the increase in the number of lines, and can prevent the occurrence of noise and mutual interference at signal terminals.

  The present invention has been made to solve the above problems, and is an interchangeable lens camera characterized by taking the following technical means. That is, according to the present invention, the electrical connection terminal between the lens unit and the main body is separated into a plurality of blocks for each type, and the separated blocks are respectively separated on the connection part circumference of the mount part of the interchangeable lens camera. Are interchangeable lens cameras.

  The present invention is preferably applied particularly when a large number of communication functions are required between the lens unit and the camera body, and the ground, the power supply, and the signal terminals are arranged in separate blocks. This is intended to prevent short circuits, noise generation, mutual interference, and the like.

  In the above interchangeable lens camera, when the lens unit is attached to the camera body, if the power supply terminal is positioned so that it is connected after the other terminals are connected, an unexpected voltage is applied to the circuit before a normal electrical circuit is formed. It is foolproof without giving a load.

  In the interchangeable lens camera, it is more preferable that the signal block is further separated into a plurality of signal blocks. For example, the power supply, high-speed serial, analog, 5V system, 3V system, etc. are separated. The signal terminals are divided into a plurality of independent blocks, and each block is separated for each similar signal.

  In the above interchangeable lens camera, it is preferable that a large number of connection terminals can be arranged in a narrow range by forming the connection terminals in the separated block in a plurality of layers in the optical axis direction. In this case, it is preferable to arrange a plurality of layers of terminals in a lattice shape, a honeycomb shape, or a staggered manner to improve space efficiency.

  It is preferable that the plurality of separated blocks are disposed on the back side of the plurality of mount claws to prevent contact with foreign matter. Here, the back side of the mount claw means a space behind the mount claw and behind the nail when the mount of the camera body is viewed from outside the camera.

  Next, according to a second aspect of the present invention, the electrical connection terminals excluding the ground between the lens unit and the main body are separated into a plurality of blocks for each type, and separated on the circumference of the connection part of the mount part of the interchangeable lens camera. Each of the separated blocks is disposed at a position, and the ground is a direct contact portion between the lens unit and the main body.

  In this case, the ground is in direct contact with the conductor portion of the lens unit and the camera body, and the connection terminal can be omitted.

  According to the present invention, the electrical connection terminal between the lens unit and the main body is separated into a plurality of blocks for each type, and the separated blocks are arranged at positions on the circumference of the connection part of the mount part of the interchangeable lens camera. Since the power supply terminal block is an interchangeable lens camera that is positioned so as to be connected after other blocks are connected to each other, the electrical connection terminals are easily short-circuited even by foreign matter. There is nothing. In addition, it is possible to cope with an increase in the number of signal lines, and there is an excellent effect that no noise or mutual interference occurs at the signal terminals.

  The ground connection terminal can be omitted by providing the ground at the direct contact portion between the lens unit and the camera body.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1A and FIG. 1B are explanatory views showing an example of arrangement of connection terminals in the mount portion of the interchangeable lens camera according to the embodiment of the present invention. FIG. 1A is a front view seen from the camera side, and FIG. 1B is a longitudinal sectional view showing a state in which the lens unit 20 is attached to the camera body 30. The mount on the camera body side has a claw 32 and a notch 31 between the claw and the claw, and separated terminal blocks 41, 42, 43 are provided on the back side of each claw 32, respectively.

  As shown in FIG. 1A and FIG. 1B, the power terminal block 42, the signal terminal block 43, and the ground terminal block 41 are arranged at separate positions to form independent blocks. The insertion and removal positions of the camera mount and the lens mount are determined according to the size and arrangement of the claws. In other words, the claw angle on the lens side and the claw angle on the camera mount are adjusted, and the mount portion is not engaged at a position other than the position where specific claws coincide with each other. Therefore, when the lens unit 20 is attached to the camera body 30, the insertion position is restricted, so that different terminals do not come into contact with each other and are not accidentally short-circuited. Even if a foreign object such as a metal piece enters, the position of the power terminal block and the other block is greatly separated, so that a short circuit accident does not occur.

  As shown in FIG. 1B, for example, the terminal block 42 that contacts the terminal 21 of the lens unit 20 is provided on the back side of the claw 32, and the contact of the connection terminal of the terminal block 42 is protected by the claw 32. It has become. FIG. 1B shows a barrier 60 that closes the hole of the lens unit mounting portion when the lens unit 20 is removed, and a spring 61 that biases the barrier 60 toward the closing position.

  FIG. 2 is an explanatory view showing another embodiment of the present invention. In FIG. 2, the lens unit 20, the camera body 30, the claw 32, the notch 31, and the terminal blocks 41 and 42 are the same as those in FIG. As shown in FIG. 2, the ground terminal block 41, the power supply terminal block 42, and the signal terminal blocks 43 and 44 are independent blocks. Since the signal terminal blocks 43 and 44 are divided into a plurality of blocks 43 and 44, for example, a high-speed serial signal and an analog signal can be separated for each similar signal to avoid electrical interference.

  FIG. 3 is a longitudinal sectional view of a contact terminal having two layers in the optical axis direction, and FIG. 4 is a front view of the terminal (development). FIG. 4 shows an example in which the terminals 21 and 22 are arranged in a staggered arrangement. However, the present invention is not limited to this, and other arrangements such as a lattice arrangement and a honeycomb arrangement may be used. Etc. By disposing in a plurality of layers, the number of contact terminals provided behind the claw with a limited circumferential length can be increased.

  FIG. 5 shows a ground connection between the mount on the lens 20 side and the mount itself on the camera body 30 side without using a ground terminal. FIG. 6 is an enlarged view of a portion A in FIG. . When the lens unit 20 side mount itself is provided with a ground part 46 and the camera body 30 side mount is provided with a ground part 45 and grounded 47 respectively, and the lens unit 20 and the camera body 30 are joined together, The ground is connected. In this technique, the ground terminal can be omitted, and it becomes easier to separate the electrical connection terminals for each block.

It is the front view which looked at the mount part of the Example from the camera side. It is a longitudinal cross-sectional view of Fig.1 (a). It is the front view which looked at the mount part of another Example from the camera side. It is a longitudinal cross-sectional view of the mount part of another Example. It is a front view which shows the example of arrangement | sequence of the contact of a lens unit. It is a longitudinal cross-sectional view of the mount part of other Example. It is the A section enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mount part 20 Lens unit 21, 22 Terminal 30 Camera main body 31 Notch 32 Nail | claw 41 Ground terminal block 42 Power supply terminal block 43, 44 Signal terminal block 45, 46 Ground part 47 Grounding 60 Barrier 61 Spring

Claims (7)

  The electrical connection terminal between the lens unit and the main body is divided into a plurality of blocks for each type, and the separated blocks are arranged at positions on the circumference of the connection part of the mount part of the interchangeable lens camera. An interchangeable lens camera.   2. The interchangeable lens camera according to claim 1, wherein when the lens unit is mounted on the camera body, the power terminal block is positioned so as to be connected after the other block.   2. The interchangeable lens camera according to claim 1, wherein the separated blocks are power supply, signal, and ground blocks.   4. The interchangeable lens camera according to claim 3, wherein the signal block is further divided into a plurality of signal blocks.   5. The interchangeable lens camera according to claim 1, wherein the connection terminals in the separated block are formed in a plurality of layers in the optical axis direction.   6. The interchangeable lens camera according to claim 1, wherein each of the separated blocks is a terminal arranged on the back side of a plurality of mount claws.   The electrical connection terminal excluding the ground between the lens unit and the main body is separated into a plurality of blocks for each type, and each of the separated blocks is arranged at a position apart on the circumference of the connection part of the mount part of the interchangeable lens camera. In addition, an interchangeable lens camera characterized in that the ground is in direct contact with the lens unit and the main body.

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